Fix building the silo when shared-mime-info is installed

[hughsie]

shared-mime-info 2.5.1 added a application/x-freedesktop-appstream-component that is a subclass of application/xml -- which breaks the explicit content type checks in the source builder. Abort the loop for any XML subclass instead to cover both cases.

Fixes: #325

Summary by CodeRabbit

• Bug Fixes
  • Improved XML content detection so files identified as application/xml are handled correctly.
  • Preserved support for text/xml and compressed XML processing.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b55238a9-bb95-4eec-b760-c6d1f551ea57

📥 Commits

Reviewing files that changed from the base of the PR and between 16bc869 and 2647034.

📒 Files selected for processing (1)

• src/xb-builder-source.c

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📝 Walkthrough

Walkthrough

The builder source now recognises XML-derived content types, including AppStream MIME types, when determining whether a stream is ready for XML parsing.

Changes

XML content detection

Layer / File(s)	Summary
Accept XML subtypes src/xb-builder-source.c	The stream adapter loop replaces the exact application/xml comparison with g_content_type_is_a, while retaining existing alias handling and adapter behaviour.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main change: fixing XML subclass handling for AppStream builds with shared-mime-info.
Linked Issues check	✅ Passed	The code change implements the requested fix by accepting XML subclasses, so AppStream .metainfo, .appdata and .releases files are processed.
Out of Scope Changes check	✅ Passed	The patch is narrowly scoped to the MIME-type check and adds no unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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